Tankless Water Heater Repair & Installation in Raleigh, NC
5-year parts & labor warranty on qualified new equipment
Insured and Bonded Technicians
Free In-Home Quotes
ARC Plumbing installs, repairs, and maintains Rinnai tankless water heaters for homes throughout Raleigh, Cary, Apex, Fuquay-Varina, Holly Springs, and the rest of Wake County. We standardized on Rinnai because it’s the brand we trust to perform — and because when something does need service, we already know the system inside and out. Free on-site quotes, no trip charges, and same-day repair calls whenever we can get to you.
To schedule an appointment with one of our skilled water heater experts, all you need to do is call us today at (919) 888-3500. We are here and ready to assist you!
What Is a Tankless Water Heater?
Unlike a traditional tank water heater, which keeps 40-80 gallons of water hot around the clock whether you’re using it or not, a tankless (or “on-demand”) water heater only heats water as it flows through the unit. When you turn on a hot tap, water passes over a set of heat exchangers that activate instantly, so you get continuous hot water without a tank slowly running out mid-shower — and without paying to keep a tank full of water hot 24/7.
Benefits of Going Tankless
- Lower utility bills. Most homeowners see roughly 10-20% savings on water heating costs after switching from a tank unit.
- Never run out of hot water. No more waiting for a tank to refill between showers.
- Saves space. A tankless unit mounts on the wall and frees up the closet or utility room a tank used to take up.
- Longer lifespan. A well-maintained Rinnai tankless unit typically lasts 20 years or more, roughly double the lifespan of a standard tank water heater.
- Ideal for vacation or second homes. No standing tank means no risk of a slow leak flooding the house while you’re away, and no cost to keep a tank hot when nobody’s there to use it.
Worth knowing before you switch
Tankless units cost more upfront than a tank water heater, and very large households running multiple hot-water fixtures at once may need a second unit or a higher-capacity model. We’ll talk through both of those honestly during your quote — we’d rather you know the tradeoffs than find out after the fact.
Our Recommended Models — Rinnai RX199 vs. RXP199
Both of these are Rinnai’s Sensei+ series, ultra-low NOx, condensing tankless units — the difference comes down to one thing: the recirculation pump.
Rinnai RX199
- Up to 199,000 BTU input, up to 11 GPM flow rate
- 0.98 UEF (98% efficient), ENERGY STAR certified
- Indoor venting (concentric or PVC/CPVC)
- Freeze protection down to -22°F — built for NC winters
- No built-in recirculation pump
Rinnai RXP199
- Same core performance as the RX199 — 199,000 BTU, up to 11 GPM, 0.98 UEF
- Built-in recirculation pump, so hot water arrives at distant fixtures faster with far less water wasted down the drain waiting for it to heat up
- Indoor or outdoor installation
- Wi-Fi enabled for remote temperature control and monitoring
Why ARC Plumbing Installs Rinnai
We’re a Rinnai-certified installer, and it’s the only tankless brand we recommend to our customers. A few reasons why:
- Reliability track record. Rinnai has manufactured tankless water heaters longer than almost anyone in the category, and it shows in how few callbacks we get.
- Efficiency. Our go-to models carry a 0.98 Uniform Energy Factor (UEF) — meaning 98% of the energy they use goes directly into heating your water — and are ENERGY STAR certified.
- Parts and service availability. Because we install Rinnai on the vast majority of our jobs, we keep common parts on hand and our techs are deeply familiar with the platform, which usually means a faster repair.
Happy Clients
Our 10 year old Rinnai Instant hot water heater stopped working; I called ARC plumbing and they came over within an hour to diagnose the situation. Needed a PC board. Long story short, after waiting a week to get the factory direct part, the problem was also due a mouse family that moved into the water heater and chewed up some wires. No diagnostic code for that! They made it possible to replace the entire unit on the same day, with us buying a new one, and they did not charge us for the previous service. We were thrilled with nice hot water after 10 days of glamping. Brantley, Clay and Shane did a fantastic job overall; they are polite and easy to work with.
C.M.
Tankless Water Heater Repair, Maintenance & Replacement in Raleigh
Repair: Rinnai tankless units are reliable, but like any appliance they can throw an error code, lose flow, or stop igniting. Our techs are Rinnai-trained and carry common parts, so most repairs are done in a single visit.
Maintenance: Tankless units need periodic descaling/flushing to clear mineral buildup from the heat exchanger — especially important with the hard water common across the Triangle. We recommend an annual flush to keep your unit running at full efficiency and protect the warranty.
Replacement: Already have an aging tank unit or a different brand of tankless system giving you trouble? We handle full replacements and can typically get a new Rinnai system installed same-day or next-day.
Call Arc Plumbing Today
If you’re considering upgrading to a tankless water heater or require repair or maintenance services for your existing unit, look no further than ARC Plumbing. Our team of experienced professionals is here to help you make an informed decision that meets your needs and budget while delivering exceptional service every step of the way. Contact us today to learn more about our tankless water heater services and schedule an appointment. Let us keep your hot water flowing for years to come!
How much does a tankless water heater cost to install?
Cost depends on your home’s existing setup (gas line, venting, electrical) and which model you choose, but most Rinnai tankless installations in the Raleigh area run $3,000 – $7,000 once existing plumbing/venting is accounted for. We always provide a free on-site quote before any work starts, so there’s no guessing.
What's the difference between the Rinnai RX199 and RXP199?
Both deliver the same 199,000 BTU output and 0.98 UEF efficiency rating. The RXP199 adds a built-in recirculation pump, which gets hot water to your fixtures faster and wastes less water waiting for it to heat up — the RX199 doesn’t include that pump.
How long do Rinnai tankless water heaters last?
With regular maintenance, Rinnai tankless units typically last 20 years or more — roughly double the lifespan of a standard tank water heater.
Do tankless water heaters need maintenance?
Yes. We recommend an annual descaling/flush to clear mineral buildup from the heat exchanger, particularly given the hard water common in the Raleigh/Wake County area. Skipping maintenance can shorten the unit’s lifespan and void the manufacturer warranty.
Is a tankless water heater right for my home?
In most cases, yes — but it depends on your gas line capacity, venting situation, and hot water demand. We’ll evaluate your home’s setup during a free quote and recommend the right model (or tell you honestly if a tank unit still makes more sense for your situation).
